A few that spring to mind:
Resident Evil - dogs jumping through the window.
Mario 64 - entering a room with a huge mirrored wall, noticing the reflection of the 'cameraman' ('Lakitu'?) and suddenly realising with a shock that my view is his view and that this has been the case throughout the game. A really clever bit of design.
Silent Hill - coming out of a room in the school, and gradually becoming aware that I'm in a different corridor (one floor up or down if I remember correctly).
Prince of Persia TSOT - being able to rewind time!
Resident Evil - dogs jumping through the window.
Mario 64 - entering a room with a huge mirrored wall, noticing the reflection of the 'cameraman' ('Lakitu'?) and suddenly realising with a shock that my view is his view and that this has been the case throughout the game. A really clever bit of design.
Silent Hill - coming out of a room in the school, and gradually becoming aware that I'm in a different corridor (one floor up or down if I remember correctly).
Prince of Persia TSOT - being able to rewind time!